Two dinuclear Cu-11 complexes of formula [CU2(dpyam)(4)(mu-C2O4)](PF6)(2)(H2O)(2) (1) and [CU2(dpyam)(2)(mu-C2O4)(NO3)(2)(DMF)(2)] (2) (dpyam = di-2-pyridylamine) have been synthesized and their spectroscopic and magnetic properties characterized. Complex (1) crystallizes in the non-centrosymmetric monoclinic space group Pc, while (2) crystallizes in the non-centrosymmetric triclinic space group P1. Compound (1) involves the compressed octahedral Cu-11 environment, whereas (2) exhibits an elongated octahedral Cull geometry. Both complexes contain six-coordinate metal centers bridged by planar bis-didentate oxalate group. The geometry, spectroscopic properties and the effective magnetic moment of (1) are very close to those of the recently published [Cu-2(dpyam)(4) (mu-C2O4)](CIO4)(2)(H2O)(3) and [Cu-2(dpyam)(4)(mu-C-2-O-4)](BF4)(2)(H2O)(3). Thus (1) is expected to exhibit a very weak ferromagnetic interaction between the Cu-11 centers which is confirmed by EPR spectrum. Those of (2) are comparable to those of the recently published [Cu-2(dpyam)(2)(mu-C2O4)(NO3)(2)(DMSO)(2)]. Therefore a strong antiferomagnetic interaction is expected. The effective magnetic moment at room temperature of (1) was measured to be 2.55 BM/dimer, which agrees with the spin only value of Cu-11, 2.45 BM calculated for two uncoupled spin = 1/2 centers. In (2) the room temperature effective magnetic moment of 2.16 BM/dimer indicates the partial spin paring by antiferromagnetic coupling. This is confirmed by the e.p.r. spectrum and is explained as a result of the magnetic interaction between the coplanar d(x2-y2) orbitals on the two copper atoms.